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A300 captain experiences a dual FMC malfunction at FL330 that causes the autopilot to disengage and the aircraft to pitch up. The aircraft is returned to assigned altitude and both FMC's resume normal operation.
| Attributes | |
| ACN | 947326 |
| Time | |
| Date | 201105 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZZZZ.ARTCC |
| State Reference | FO |
| Environment | |
| Flight Conditions | Mixed |
| Light | Dusk |
| Aircraft 1 | |
| Make Model Name | A300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | FMS/FMC |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 75 Flight Crew Total 9000 Flight Crew Type 75 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance |
Narrative:
During cruise flight at FL330 with autopilot #1 engaged; the autopilot suddenly disconnected and the nose pitched upward. Altitude deviation of about 210 ft was arrested and descent back to FL330 was initiated. Both FMC's stated 'please standby' in the scratch pad. ATC inquired about altitude deviation; we responded that we had an autopilot anomaly and that everything had returned to normal. Wind at the time 276/63; with light intermittent turbulence. Tat -13c; sat -41c.
Original NASA ASRS Text
Title: A300 Captain experiences a dual FMC malfunction at FL330 that causes the autopilot to disengage and the aircraft to pitch up. The aircraft is returned to assigned altitude and both FMC's resume normal operation.
Narrative: During cruise flight at FL330 with autopilot #1 engaged; the autopilot suddenly disconnected and the nose pitched upward. Altitude deviation of about 210 FT was arrested and descent back to FL330 was initiated. Both FMC's stated 'Please Standby' in the scratch pad. ATC inquired about altitude deviation; we responded that we had an autopilot anomaly and that everything had returned to normal. Wind at the time 276/63; with light intermittent turbulence. TAT -13c; SAT -41c.
Data retrieved from NASA's ASRS site as of April 2012 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.